Here's another lockdep report for you. If you hard link a file, the attached
occurs.
=============================================
[ INFO: possible recursive locking detected ]
3.15.0-rc6-fsdevel+ #367 Tainted: G W
---------------------------------------------
ln/2974 is trying to acquire lock:
(&sb->s_type->i_mutex_key#9/2){+.+.+.}, at: [<ffffffff81137121>] generic_file_splice_write+0x88/0x154
but task is already holding lock:
(&sb->s_type->i_mutex_key#9/2){+.+.+.}, at: [<ffffffff8111cf8d>] lock_rename+0xd3/0xdc
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&sb->s_type->i_mutex_key#9/2);
lock(&sb->s_type->i_mutex_key#9/2);
*** DEADLOCK ***
May be due to missing lock nesting notation
7 locks held by ln/2974:
#0: (sb_writers#15){.+.+.+}, at: [<ffffffff8112bf5b>] mnt_want_write+0x1c/0x40
#1: (&sb->s_type->i_mutex_key#17/1){+.+.+.}, at: [<ffffffff8111c928>] kern_path_create+0x76/0x121
#2: (&sb->s_type->i_mutex_key#17){+.+.+.}, at: [<ffffffff8111adfd>] vfs_link+0xf3/0x269
#3: (sb_writers#8){.+.+.+}, at: [<ffffffff8112bf5b>] mnt_want_write+0x1c/0x40
#4: (&type->s_vfs_rename_key){+.+.+.}, at: [<ffffffff8111cef5>] lock_rename+0x3b/0xdc
#5: (&sb->s_type->i_mutex_key#9/1){+.+.+.}, at: [<ffffffff8111cf78>] lock_rename+0xbe/0xdc
#6: (&sb->s_type->i_mutex_key#9/2){+.+.+.}, at: [<ffffffff8111cf8d>] lock_rename+0xd3/0xdc
stack backtrace:
CPU: 1 PID: 2974 Comm: ln Tainted: G W 3.15.0-rc6-fsdevel+ #367
Hardware name: /DG965RY, BIOS MQ96510J.86A.0816.2006.0716.2308 07/16/2006
0000000000000000 ffff8800383399c0 ffffffff8148b779 ffffffff81ffa7a0
ffff880038339a80 ffffffff81074b0e ffff880038339a00 ffff880038339a80
0000000000000000 0000000000000000 ffff880000000006 ffffffff00000000
Call Trace:
[<ffffffff8148b779>] dump_stack+0x4d/0x66
[<ffffffff81074b0e>] __lock_acquire+0x75a/0x1861
[<ffffffff810762b6>] lock_acquire+0x9c/0x112
[<ffffffff81137121>] ? generic_file_splice_write+0x88/0x154
[<ffffffff811fb909>] ? avc_has_perm+0x1d/0x13b
[<ffffffff8148e5cf>] mutex_lock_nested+0x60/0x2ff
[<ffffffff81137121>] ? generic_file_splice_write+0x88/0x154
[<ffffffff81137121>] generic_file_splice_write+0x88/0x154
[<ffffffff8113777e>] direct_splice_actor+0x31/0x33
[<ffffffff81137329>] splice_direct_to_actor+0xc6/0x188
[<ffffffff8113774d>] ? opipe_prep.part.8+0x9e/0x9e
[<ffffffff8113745e>] do_splice_direct+0x73/0x9b
[<ffffffff811e3375>] ovl_copy_up_one+0x509/0x586
[<ffffffff811e3490>] ovl_copy_up+0x9e/0xd3
[<ffffffff811e2063>] ovl_link+0x1f/0x55
[<ffffffff8111ae70>] vfs_link+0x166/0x269
[<ffffffff8111f4fd>] SyS_linkat+0x103/0x21d
[<ffffffff814924f4>] tracesys+0xdd/0xe2
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